Flush valve



FIG. 1 is a side view of a flush valve showing our new design;

FIG. 2 is a top view of our new flush valve design;

FIG. 3 is a front view of our new flush valve design;

FIG. 4 is a rear view of our new flush valve design;

FIG. 5 is a bottom view of our new flush valve design;

FIG. 6 is a side view, from the right-hand side of FIG. 3, showing our new flush valve design. 

The ornamental design for a flush valve, as shown and described. 